What tools are used to study climate? (running time: 3 minutes 44 seconds)Caspar
Ammann, Jerry Meehl, Kevin TrenberthClimate modelers and analysts explain the complexity and reliability of the observations, prehistoric records, and climate models used to study past, present, and future climate.

What is meant by "climate uncertainty?" (running time: 2 minutes 58 seconds) Jerry
Meehl, Bill Collins, Caspar Ammann, Linda MearnsThe more we understand the sources of uncertainty, the better the science. Sources in climate science include differences in the behavior of computer models and the lack of a crystal ball to tell us how human beings will behave in the future (in terms of population growth, industrial activities, transportation, and so on). Even so, the scientists note, it's possible to act based on what we already know with considerable confidence about global warming and climate change.

What are the likely impacts of climate change? (running time: 8 minutes 5 seconds)Warren
Washington, Kevin Trenberth, Mickey Glantz, Joanie Kleypas, Bill Collins,
Linda MearnsThese scientists describe some of the major environmental impacts of global warming already being seen and expected in the future.

What is meant by "climate commitment?" (running time: 3 minutes 42 seconds)Tom
Wigley, Bill CollinsWe know that carbon dioxide stays in the atmosphere for about 100 years. By adding extra greenhouse gases to the atmosphere over the last century, humanity has already committed the planet to warmer temperatures and climate change.

How can we respond to the problem? (running time: 5 minutes 18 seconds)Kevin
Trenberth, Jerry Meehl, Tom Wigley, Joanie Kleypas, Mickey Glantz, Warren WashingtonThe scientists outline what it will take to face the realities of global warming and climate change head on.